Helmets

Helmets are designed to protect you from one accident, and one accident only. Sometimes damage isn’t visible, so buy a new helmet to make sure you’re getting full protection.

Child car seats

iStock/Ziviani

Like helmets, car seats are really only meant to protect in one accident. But damaged car seats are common; a survey found that one in ten have been in an accident. Plus, car seat technology improves each year.

Tires

Bart Sadowski

If they’ve been in an accident, tires are likely to be unstable and unreliable. Make sure you can get an accurate history.

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Wet suits and swimsuits

iStock/JoeLena

Personal products that hug your body are technically safe if you wash them in hot water... and still we're cautious. But constant changes in water pressure also wear out swimwear faster than regular clothing, so it's likely a used wetsuit or swimsuit will tear.

Mattresses

iStock/baytunc

Bed bugs could lurk in any used mattress. You might also end up sleeping with other people’s mold, mites, bacteria, and bodily fluids (yuck!).

Cribs

iStock/poligonchik

Scores of crib recalls, as well as changing safety standards, make it hard to verify the safety of a used crib.

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Laptops or other devices

iStock/xijian

Laptops, e-readers, tablets, or mp3 players are more likely to be dropped, knocked around, and spilled on, simply because they’re out in the world. A desktop computer sits (mostly) safe at home, but even that would likely cost more to upgrade than buy new.

TVs

iStock/AnirutKhattirat

It’s hard to determine how well TVs, DVD players, and other electronic devices have been cared for by their previous owners. Plus, technology changes so quickly that you can often get a better quality device. If you're buying refurbished devices directly from a manufacturer, you'll be covered by a warranty—but a random TV at a garage sale could be hit or miss.

Shoes

iStock/MattiaMarasco

Used shoes have been molded to their previous owner’s feet—and poorly fitting shoes will make you miserable, or you'll just never want to wear them.

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Sheets and Pillowcases

iStock/magnez2

Sure, you can wash them in hot water, but that might not protect against bed bugs.

Baby bottles

iStock/fivepointsix

While sanitation and cracks can be an issue, the real culprit is the chemical BPA that's present in most older bottles—and as of June 2012, the FDA no longer accepts that as safe. Go with new bottles to make sure you're getting the safest, most up-to-date bottles.

Worn plates, pots, and other cookware

iStock/saw

Rust, flaky non-stick coatings, and chemicals that leach out are just a few of the safety problems you can run into with older cookware.

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DVDs, CDs, and VHS tapes

iStock/junce

If you're still using this technology and looking to scoop up a bargain, know that scratches have ruined many a DVD or CD—and VHS tapes lessen in quality the more times they're played, not to mention disintegrate over the years.

Upholstered furniture

iStock/vichie81

Just like mattresses and sheets, any upholstered furniture can be home to bed bugs, fleas, and spiders, as well as unknown odors and stains. Unless you're going to reupholster the piece, steer clear.

Clothes that require a tailored fit

iStock/Armin Staudt

It might look like it fits—until you put it on. Unless you can try something on, it's often not worth the money you'll spend on alterations.

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Video Games

iStock/Robert Herhold

You might want to quickly google the video game—manufacturers are now including codes for one-user only play, either for the whole game or special bonus sections.

Fragrance or makeup (new or old!)

iStock/ronnisugiharto

The quality of both can lessen over the years (and yes, they do expire!). Even if makeup is brand new in the box, skip it unless you can tell that it was recently manufactured.

Stuffed animals

iStock/RapidEye

Stuffed animals can be hard to send through the extra-hot cycle on a washing machine, and like mattresses and upholstered furniture, they can be full of creepy crawlies and other unsavory finds.

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Blenders and other kitchen electronics

iStock/Black-Crow

Your go-to smoothie maker's blades and mechanisms can become dull and wear down over time, even if the machine looks fine on the surface.

Running shoes

iStock/OlafSpeier

Used running shoes are often devoid of the cushioning that runners need; stick with new shoes for the cushioning and fit that will protect knees, feet, and legs.